Jingle mail is the package containing the keys to your house that you send back to the bank when the interest rate on your adjustable-rate or IO/neg-am mortgage resets, or the property tax bill gets reassessed at double what it was two years ago, or you find out that heating and AC and repairs cost a ton of freaking money, or you lose your job because of the recession that's coming with the housing crash, and you can't make the payments any more.

My neighbor put up the Escalade and the Beemer that he bought with his third HELOC for sale, and has been having garage sales every week for the last month to raise cash ... I give it about 90 days till he sends in the jingle mail.